Milling machine attachment



April 17, 1945. R. J. BROWN MILLING MACHINE ATTACHMENT Filed Jan. 24.1944 T....UUI

Patented Apr. 17, 1945` e UNITED STATES PATENT eoFFicE.

l L `.2,'373,944 i MILLINGMAGHINE ATTACHME T j Robert Brown, Ilyons,Ill.

Application January 24, 1944, Serial No.l 519,491

` 1 claim. Koren-413.5)

This .invention relates to an attachment for gear milling machines, andhas for the .primary object the provision of van attachment especiallyadapted for milling or making ,determined cuts in stock for themanufacture of impellers used in superchargers for engines and otherdevices. Another cbj ect of this invention is the provision of anattachment for the milling machine which includes a power driven cutterand a support therefor which when in operation will present the cutteragainst the work or stock Ifor cutting action thereon and cause thecutter to make an arcuately curved cut for the rst part of rthe cuttingstroke and a substantially straight cut for the remainder of said strokeand to returnthe cutter to its starting position after the completion ofthe cutting stroke.

With these and other objects in view'a's will become more apparent asthe description proceeds, the invention consists in certain novelfeatures of construction, combination and arrangement of parts as willbe hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is'to be had tothe following description and accompanying drawing, in which:

Figure 1 is a side elevation illustrating a portion of a milling machineequipped with an attachment in accordance with my invention.

Figure 2 is a sectional view taken on the line 2 2 Of Figure 1.

Figure 3 is a sectional View taken on the line 3-3 of Figure 1.

Referring in detail to the drawing, the numeral 5 indicates afragmentary portion of a gear milling machine to which the presentinvention is adapted, the milling machine being employed for the supportof the stock 6 to be cut. Milling machines of this character areequipped with a reversible power shaft indicated by the character l'.This shaft on one cycle of operation of the milling machine rotates inone direction and on the next cycle of operation of the milling machinerotates in a reverse direction. These features are merely stated to givea clear conception of the present invention which is in the form of anattachment easily installed on a milling machine, as shown in Figure 1.

The attachment includes an elongated support 8 pivoted on the millingmachine opposite the work, as at 8,' andhas connected adjacent the otherend a pitman IIJ. A pivotal connection is provided between the member 8and the pitman, as shown at II. The other end of the pitman I hasjournaled thereon rollers I2 which ride upon spring I4 connected tothe'member 8 maintains the rollers I2 in riding contact with the cams I3at all times. A suitable guide I2 is provided for the pitman IIJ toprevent the rollers I 2 from moving oif the cam.

Slidable on the member 8 is a carriage I5 including a threaded portionmeshing with the threads of a feed shaft i6 paralleling the member 8 andjournaled thereto, as shown at I1. The carriage I5 rotatably supports apower driven cutter I8. The power'source for the cutter I8 is not shown,however, an electric motor may be connected directly to the `shaft ofthe cutter and supported by the carriage I5.

Ay shaft I9 paralleling the member 8 and feed shaft I6 is journaled onthe member 8 and geared to the feed shaft, as shown at 20. A shaft 2l injournaled on the milling machine and is geared to the shaft by a wormand worm gear designated by the character 22. Gears 24 connect theshafts 'I'he gears 24 are shaped so that the member 8 carrying thecarriage I5 may swing on the pivot 9 while the shafts I8 and 2l remaincoupled together at all times.

The feed shaft I6 reciprocates the carriage I5 on the member 8 duringthe swinging movement of the carriage toward and from the work. Thiscauses the cutter I 8 to 'travel on a cutting stroke and a reversestroke. On the cutting stroke of the cutter, the member 8 under theinfluence of the cams is caused to travel or swing toward the work E andas the carriage slides in one direction o-n the member 8 during saidmovement thereof ton ward the work, the cutter I8 is caused to make anarcuate shaped cut on the first .part of its cutting stroke and then cutin a substantially straight path on the remainder of its cutting stroke,forming a out in the face of the work I as indicated by dotted lines inFigure 1, thus shaping the front face of the work to resemble the frontface of an v impeller including the hub portion and blades.

It is to be understood that in fonming the various blades as specifiedseveral of such cuts must be made in the front face of the stock. Saidcuts may be made either before or after the stock has been severed fromitsperiphery toward its hubin forming the individual blades. As thecutter I8 completes its cutting stroke the carriage is then caused totravel in a reverse direction on the member 8 and the latter to swingaway from the work t, repositioning the cutter at the beginning ofanother cutting stroke.r

It will be seen that the reciprocation of the carriage and the swingingof the member 8 is brought y about through the reverse rotation of thecams I 3 by the shaft 'I of the milling machine. Further, it is to beunderstood that after each cut made in the work 6 by the outtter I8, thework is rotated to bring another portion of the face of the work inposition to be acted on by the cutter I8. It will, therefore, be seenfrom the foregoing description, taken in connection with theaccompanying drawing, that a very eiiicient attachment has beenvprovided for a milling machine whereby stock may have one face thereoffcut .in `such a manner 'that will 'form said face of the Work to y havethe appearance of an imipeller, the entire operation of the attachmentbeing automatic requiring only the changing of the position of vthe workwith respect to the cutter after each cutting stroke. However, on somemilling machines -even the changing of the position of the Work withrespect to the cutter of the attachment can be automatically carried outafter each cutting stroke of the cutter.

While I have shown and 4described Athe preferred embodiment of myinvention, it will be understood that minor changes in construction,combination and arrangement of parts may be made without departing fromthe spirit Vand scope of the invention as claimed.

Having thus described the invention, what I claim is: In combinationwith a milling machine including means for the support of stock and areversible drive shaft, -a support mounted on the machine `for swingingmovement toward and from the work, a. carriage slidable on the supportand .including a power driven cutter, a feed shaft connected to thecarriage and journaled on the sup- -port for the reciprocation of thecarriage on the support, a drive means connecting the feed shaft to the'drive shaft, a pitman pivoted to the sup-l port, acam-on lt'he'driveshaft, a roller on the pitman engaging the cam, and tension means actingon `the support to maintain the roller in riding contact with the cam.

ROBERT J. BROW N.

